4-Hydroxyphenylpropionylglycine

4-Hydroxyphenylpropionylglycine, a metabolite derived from the conditionally essential amino acid tyrosine, is synthesized through a process involving aromatic amino acid aminotransferase and tyrosine aminotransferase activities, with subsequent modifications by gut microbiota and glycine conjugation. Additionally, it serves as a metabolite of the phenol phloretin.